Nobody seems to complain that the housing market in SF is on fire for the same reasons that rents are up.
Even if you can afford to buy a house, it's damn near impossible to find one because sellers are getting many offers on the first day/week (a lot of which are in cash). And a lot of these offers aren't from homeowners, but rather investment companies. There was a good article in the SJ Mercury News last month about it [1]. Even if you want a house (and can afford one), the market just doesn't have enough supply, so people are then stuck renting. It really is a pretty big problem.
[1] http://www.mercurynews.com/business/ci_22930687/bay-areas-av...
And I live on the other side of the world, where house prices are too high, it causes massive problems, and nobody complains about it.
In fact prices in my suburb are about twice what they seem to be in parts of SF where it is quite safe to live:
http://www.zillow.com/homedetails/720-722-34th-Ave-San-Franc...
Here a big fall in house prices is seen as a risk rather than a good thing.